With loudspeakers, an important parameter is the frequency at which their cones resonate. This clever Arduino-based tester ...

The phase determines the oscillation frequency, and gain is a criterion for oscillation to exist. The four poles in the loop equation each contribute –45° phase shift accumulating the required total ...

The Office of Special Counsel is again enforcing the Hatch Act against federal employees who committed violations of the ethics law while working for an agency but have since left federal service, ...